[igt-dev] [PATCH i-g-t] tests/kms_concurrent: Test for maximum number of planes

[Mika Kahola]

In some cases we ran out of bandwidth when executiong a test.
An error such as this can be seen on dmesg

"Bandwidth 16632 MB/s exceeds max available 6553 MB/s (7 active planes)"

The patch tests first, how many planes the platform can support with
the given resolution. The actual test is then performed by using the
calculated maximum number of planes instead of maximum number of planes
that the platform supports.

Signed-off-by: Mika Kahola <mika.kahola at intel.com>
---
 tests/kms_concurrent.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/tests/kms_concurrent.c b/tests/kms_concurrent.c
index 14ca5fab..61137139 100644
--- a/tests/kms_concurrent.c
+++ b/tests/kms_concurrent.c
@@ -196,20 +196,19 @@ prepare_planes(data_t *data, enum pipe pipe, int max_planes,
 }
 
 static void
-test_plane_position_with_output(data_t *data, enum pipe pipe, igt_output_t *output)
+test_plane_position_with_output(data_t *data, enum pipe pipe, int max_planes,
+				igt_output_t *output)
 {
 	int i;
 	int iterations = opt.iterations < 1 ? 1 : opt.iterations;
 	bool loop_forever = opt.iterations == LOOP_FOREVER ? true : false;
-	int max_planes = data->display.pipes[pipe].n_planes;
 
 	igt_pipe_refresh(&data->display, pipe, true);
 
 	i = 0;
 	while (i < iterations || loop_forever) {
 		prepare_planes(data, pipe, max_planes, output);
-		igt_display_commit2(&data->display, COMMIT_ATOMIC);
-
+		igt_display_try_commit2(&data->display, COMMIT_ATOMIC);
 		i++;
 	}
 }
@@ -242,7 +241,7 @@ get_lowres_mode(data_t *data, const drmModeModeInfo *mode_default,
 	return mode;
 }
 
-static void
+static int
 test_resolution_with_output(data_t *data, enum pipe pipe, igt_output_t *output)
 {
 	const drmModeModeInfo *mode_hi, *mode_lo;
@@ -294,6 +293,8 @@ test_resolution_with_output(data_t *data, enum pipe pipe, igt_output_t *output)
 
 		i++;
 	}
+
+	return max_planes;
 }
 
 static void
@@ -301,6 +302,7 @@ run_test(data_t *data, enum pipe pipe, igt_output_t *output)
 {
 	int connected_outs;
 	int n_planes = data->display.pipes[pipe].n_planes;
+	int max_planes = n_planes;
 
 	if (!opt.user_seed)
 		opt.seed = time(NULL);
@@ -311,9 +313,10 @@ run_test(data_t *data, enum pipe pipe, igt_output_t *output)
 			 igt_output_name(output), kmstest_pipe_name(pipe), opt.seed);
 
 		test_init(data, pipe, n_planes, output);
+		max_planes = test_resolution_with_output(data, pipe, output);
 
 		igt_fork(child, 1) {
-			test_plane_position_with_output(data, pipe, output);
+			test_plane_position_with_output(data, pipe, max_planes, output);
 		}
 
 		test_resolution_with_output(data, pipe, output);
-- 
2.20.1